The XGetWMProtocols function returns the list of atoms
stored in the WM_PROTOCOLS property on the specified window.
These atoms describe window manager protocols in
which the owner of this window is willing to participate.
If the property exists, is of type ATOM, is of format 32,
and the atom WM_PROTOCOLS can be interned, XGetWMProtocols
sets the protocols_return argument to a list of atoms,
sets the count_return argument to the number of elements
in the list, and returns a nonzero status. Otherwise, it
sets neither of the return arguments and returns a zero
status. To release the list of atoms, use XFree.